Hello! First of all, thank you very much for your design. I don't understand why yo are not getting enough credit for this idea. My ender 3 is now almost as silent as an average pc thanks to your design. I had a rough time carving the screw holes, but once everything is in place, the results are great. I tried printing the test dog and the results are flawless, keeping the noise extremely low. About the fan, I used an Arctic p8 adjusted to 10 volts, as I assumed that static pressure would be important here. That's the same fan I used for PSU and motherboard to equalize pitch (also, I love Arctic PX series). I really recommend this design to everyone that wants to lower the noise drastically and that mainly prints in PLA. Thanks again!